<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script type="text/javascript" src="../js/vue.js"></script>
</head>
<body>
<div id="root">
    姓：<input type="text" v-model="firstName"><br>
    名：<input type="text" v-model="lastName"><br>
    全名：<span>{{firstName}}-{{lastName}}</span>
</div>
<script type="text/javascript">
    Vue.config.productionTip = false;
    const vm = new Vue({
        el: '#root',
        data() {

            return {
                firstName: "张",
                lastName: "三"
            }
        },
        methods: {}
    });
</script>
</body>
</html>